Decent trousers in golf, it appears (9)
I believe the answer is:
seemingly
'it appears' is the definition.
(as in something that appears or seems to happen)
'decent trousers in golf' is the wordplay.
'decent' becomes 'seemly' (synonyms).
'trousers' indicates putting letters inside (to trouser can mean to steal or take).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'in'+'g'='ing'
'seemly' placed around 'ing' is 'SEEMINGLY'.
(Other definitions for seemingly that I've seen before include "So it would appear" , "Apparently" .)