Joker and king involved with piquet (spades) (8)
I believe the answer is:
quipster
'joker' is the definition.
(thesaurus)
'king involved with piquet spades' is the wordplay.
'king' becomes 'r' (r is abbreviation for rex).
'involved with' indicates anagramming the letters (involved can mean confusing or complex).
'spades' becomes 's' (abbreviation in card games).
'piquet'+'s'='piquets'
'r' with its letters anagrammed with 'piquets' can make 'QUIPSTER'.
'and' is the link.
(Other definitions for quipster that I've seen before include "wit" , "wisecracker" , "Maker of witty comments" .)