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' is a charade indicator (letters next to each other).
'turned' is a reversal indicator.
'it' written backwards gives 'ti'.
'geri'+'sh'='gerish'
'gerish' after 'ti' is 'TIGERISH'.
(Other definitions for tigerish that I've seen before include "Fierce" , "feistiness" .)