Is it wrong to oust leaders in firm? (6)
I believe the answer is:
strong
'firm?' is the definition.
(I know that firm can be written as strong)
'is it wrong to oust leaders' is the wordplay.
'is it' becomes 'st' (I've seen this in other clues).
'to oust leaders' means to remove the first letter (I've seen 'ousting leader of' mean this).
'wrong' with its first letter taken away is 'rong'.
'st'+'rong'='STRONG'
'in' acts as a link.
(Other definitions for strong that I've seen before include "Vigorous" , "muscular or concentrated" , "Mighty, powerful" , "Not easily broken" , "Solid" .)