Falsely incriminate diminutive figure during drink (6,2)
I believe the answer is:
stitch up
'falsely incriminate' is the definition.
(I've seen this before)
'diminutive figure during drink' is the wordplay.
'diminutive figure' becomes 'titch' (informal term for a short person).
'during' indicates putting letters inside.
'drink' becomes 'sup' (to sup is to drink).
'titch' placed inside 'sup' is 'STITCH-UP'.
(Other definitions for stitch up that I've seen before include "Instance of making someone wrongly take the blame" , "Incriminate by informing on (someone)" , "Swindle; incriminate by informing on" , "Swindle - incriminate - repair" , "frame" .)