Angry after parking? That's appropriate (6)
I believe the answer is:
pirate
'appropriate' is the definition.
(thesaurus)
'angry after parking?' is the wordplay.
'angry' becomes 'irate' ('irate' can be similar in meaning to 'angry').
'after' means one lot of letters go next to another.
'parking?' becomes 'p'.
'irate' put after 'p' is 'PIRATE'.
'that's' is the link.
(Other definitions for pirate that I've seen before include "Rat pie (anag)" , "Illegally-copied (version)" , "Corsair" , "Illegal" , "Seaborne robber" .)