Knave of clubs put on notice (3)
I believe the answer is:
cad
'knave' is the definition.
(I've seen this before)
'clubs put on notice' is the wordplay.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'put on' means one lot of letters go next to another.
'notice' becomes 'ad' (both can mean an advertisement).
'c'+'ad'='CAD'
'of' acts as a link.
(Other definitions for cad that I've seen before include "designing software" , "An Englishman who behaves dishonourably, a rotter" , "Blackguard" , "A knave, real rotter" , "A rotter, by Jove" .)