Idol getting up on stage is a crook (6)
I believe the answer is:
dogleg
'crook' is the definition.
(I've seen this before)
'idol getting up on stage' is the wordplay.
'idol' becomes 'god' (synonyms).
'getting up' is a reversal indicator.
'on' means one lot of letters go next to another.
'stage' becomes 'leg' (a leg is a stage of a competition).
'god' back-to-front is 'dog'.
'dog'+'leg'='DOGLEG'
'is a' acts as a link.
(Other definitions for dogleg that I've seen before include "Canine angle on a golf course" , "A sharp bend of canine analogy" , "Hole with a bend in the fairway (golf)" , "the 17th at St Andrews?" , "(In golf) an angle in the fairway" .)