Crossword Genius

Battered hat, I am sure, is unprofessional (10)

Ross

I believe the answer is:

amateurish

'unprofessional' is the definition.
(synonyms)

'battered hat i am sure' is the wordplay.
'battered' indicates an anagram.
'hat'+'i'+'am'+'sure'='hatiamsure'
'hatiamsure' is an anagram of 'AMATEURISH'.

'is' acts as a link.

(Other definitions for amateurish that I've seen before include "using little craft, perhaps" , "Not very professional" , "Inept, unskilful" , "Lay" , "Unprofessional" .)

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