Jimmy —, singer-actor who played the title role in 1990s BBC TV series Spender (4)

I believe the answer is:

nail

(Other definitions for nail that I've seen before include "Horny part of the digit" , "Handy tip" , "Expose as a lie" , "Small metal spike" , "Hit this on the head to be absolutely right" .)

I've seen this clue in The Mirror.

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