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Giant going down when completely shorn (5)

Ross

I believe the answer is:

ettin

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'giant' is the definition.
(giant in Norse myth)

'going down when completely shorn' is the wordplay.
'going down when' becomes 'etti' (I can't justify this - if you can you should believe this answer much more).
'completely' becomes 'roundly' (I've seen this before).
'shorn' indicates the central letters (shorn of edges).
The central letter of 'roundly' is 'n'.
'etti'+'n'='ETTIN'

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