Hard workers in Hampshire (5)

I believe the answer is:

hants

'hampshire' is the definition.
(postal abbreviation)

'hard workers' is the wordplay.
'hard' becomes 'h' (abbreviation used in pencil classifications).
'workers' becomes 'ants' (worker ants).
'h'+'ants'='HANTS'

'in' acts as a link.

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