Lacking practice, fix cocktail (5,4)

I believe the answer is:

rusty nail

'cocktail' is the definition.
(I've seen this before)

'lacking practice fix' is the wordplay.
'lacking practice' becomes 'rusty' (I've seen this in another clue).
'fix' becomes 'nail' (I've seen this before).
'rusty'+'nail'='RUSTY NAIL'

(Other definitions for rusty nail that I've seen before include "one's likely to get hammered!" , "Strong sweet cocktail" , "one drunk at cocktail party?" .)

I've seen this clue in The Times.

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