Groaner is bad for one making arrangements (9)
I believe the answer is:
organiser
'one making arrangements' is the definition.
(I've seen this before)
'groaner is bad' is the wordplay.
'bad' indicates an anagram.
'groaner'+'is'='groaneris'
'groaneris' anagrammed gives 'ORGANISER'.
'for' is the link.
(Other definitions for organiser that I've seen before include "Manager" , "Maker of arrangements" , "bound to keep personal data" , "Runner" , "One making arrangements" .)