Crossword Genius

Lie back after drinking strong punch (4)

Ross

I believe the answer is:

biff

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'punch' is the definition.
(synonyms)

'lie back after drinking strong' is the wordplay.
'lie back' is a reversal indicator (I've seen 'lying back' mean this).
'after' becomes 'fib' (I can't explain this - if you can you should give a lot more credence to this answer).
'drinking' means one lot of letters goes inside another.
'strong' becomes 'f' (musical symbol for 'forte', 'strong' in Italian).
'fib' enclosing 'f' is 'ffib'.
'ffib' in reverse letter order is 'BIFF'.

Can you help me to learn more?

(Other definitions for biff that I've seen before include "Hard blow with fist" , "Punch" , "strike" .)

I've seen this clue in The Hindu.
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