Use suit and lie about it (7)
I believe the answer is:
utilise
'about it' is the definition.
I can't judge whether this defines the answer.
'use suit and lie' is the wordplay.
'use' indicates anagramming the letters.
'and' is a charade indicator (letters next to each other).
'suit'+'lie'='suitlie'
'suitlie' anagrammed gives 'UTILISE'.
Can you help me to learn more?
(Other definitions for utilise that I've seen before include "Employ, do something with" , "Put into service, find application for" , "Employ, make use of" , "Put to use" , "Find application or task for" .)