Spice Girl shut up after it turned catty (8)
I believe the answer is:
tigerish
'catty' is the definition.
(thesaurus)
'spice girl shut up after it turned' is the wordplay.
'spice girl' becomes 'Geri' (Geri Halliwell).
'shut up' becomes 'sh'.
'after' means one lot of letters go next to another.
'turned' shows that the letters should be reversed in order.
'it' reversed gives 'ti'.
'geri'+'sh'='gerish'
'gerish' put after 'ti' is 'TIGERISH'.
(Other definitions for tigerish that I've seen before include "Fierce" , "feistiness" .)