Conflicts when he is in form (7)
I believe the answer is:
clashes
'conflicts' is the definition.
(clashing is a kind of conflicting)
'he is in form' is the wordplay.
'is in' means one lot of letters goes inside another.
'form' becomes 'class' (synonyms).
'he' placed into 'class' is 'CLASHES'.
'when' is the link.
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