More subtle to trap King or pound? (6)
I believe the answer is:
nicker
'pound?' is the definition.
(nicker can informally mean pound sterling)
'more subtle to trap king' is the wordplay.
'more subtle' becomes 'nicer' (I've seen this in another clue).
'to trap' indicates putting letters inside.
'king' becomes 'K' (abbreviation for king in chess).
'nicer' placed around 'k' is 'NICKER'.
'or' is the link.
(Other definitions for nicker that I've seen before include "Someone who steals (a pound?)" , "PS1 (slang)" , "GBP1 (slang)" , "Sound made by horse" , "Money" .)