Choose pence before pounds - no problem! (6)
I believe the answer is:
please
'choose' is the definition.
(thesaurus)
'pence before pounds no problem' is the wordplay.
'pence' becomes 'p'.
'before' is a charade indicator (letters next to each other).
'pounds' becomes 'l' (abbreviation e.g. Lsd - pounds, shillings, pence).
'no problem' becomes 'ease' (I can't justify this - if you can you should believe this answer much more).
'p'+'l'+'ease'='PLEASE'
Can you help me to learn more?
(Other definitions for please that I've seen before include "Polite request - make someone happy" , "Make cheerful" , "Delight; amuse" , "Make glad, being asleep" , "cheer up" .)