Coax Jack into finally wearing fancy lace (6)
I believe the answer is:
cajole
'coax' is the definition.
(synonyms)
'jack into finally wearing fancy lace' is the wordplay.
'jack' becomes 'j' (playing card abbreviation).
'finally' indicates one should take the final letters.
'wearing' means one lot of letters goes inside another.
'fancy' is an anagram indicator.
The final letter of 'into' is 'o'.
'j'+'o'='jo'
'lace' with letters rearranged gives 'cale'.
'jo' going into 'cale' is 'CAJOLE'.
(Other definitions for cajole that I've seen before include "Wheedle, try to persuade" , "Wheedle - coax" , "Inveigle by gentle urging" , "Wheedle, sweet-talk" , "'Coax, sweet-talk (6)'" .)