Minor role advanced by job centre (5)
I believe the answer is:
cameo
'minor role' is the definition.
(I've seen this in another clue)
'advanced by job centre' is the wordplay.
'advanced' becomes 'came' (I've seen this in another clue).
'by' means one lot of letters go next to another.
'centre' says to take the centre.
The central letter of 'job' is 'o'.
'came'+'o'='CAMEO'
(Other definitions for cameo that I've seen before include "Small acting role; item of jewellery" , "Small role for a well-known actor" , "Piece of jewellery with carved portrait" , "Short performance" , "Small piece of hard stone carved with raised design" .)