Dear Rajesh
As the interest from the firm received by partner is offerred for taxation u/s 28 as business income, deductions u/s 32 to 37 are available to the partner. So, the partner can claim deduction of interest paid on borrowed funds which are used to invest as capital in the firm u/s 36(1)(iii). However, you may have to prove a direct nexus between the borrowed fund and the capital invested, that is to say, if you can prove that the funds so borrowed has been fully invested in the firm as capital, then you can claim interest paid as deduction. You can refer the relevant ITAT case law ACIT v. Delite Enterprises (P.) Ltd. (2011) 135 TTJ 663 (Mumbai - Tribunal) in which even the possibility of disallowance u/s 14A has been struck down.
In your case, since the interest paid is more than the interest earned, it may result in business loss in the hands of the partner which can be carried forwarded for 8 years. Also, proving the nexus between borrowed fund and invested fund becomes more important in your case since the interest paid and claimed would be less than the interest received and offered for taxation.
Regards
Ajay