Time to perform more infrequently? That's unsubtle! (8)
I believe the answer is:
tactless
'unsubtle' is the definition.
(thesaurus)
'time to perform more infrequently?' is the wordplay.
'time' becomes 't'.
'to perform' becomes 'act' (acting is a kind of performing).
'more infrequently?' becomes 'less'.
't'+'act'+'less'='TACTLESS'
'that's' is the link.
(Other definitions for tactless that I've seen before include "Lacking sensitivity, saying the wrong things" , "Unlikely to make Diplomatic Service" , "Showing insensitivity to others" , "Insensitive, having no skill at saying the right thing" , "Showing lack of skill in handling delicate situations" .)