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Police assistant has possible cold case to pursue (7,3)

Ross

I believe the answer is:

sniffer dog

'police assistant' is the definition.

'possible cold case to pursue' is the wordplay.
'possible cold case' becomes 'sniffer' (someone with a cold may be a sniffer).
'to pursue' becomes 'dog' (dogging is a kind of pursuing).
'sniffer'+'dog'='SNIFFER DOG'

'has' acts as a link.

(Another definition for sniffer dog that I've seen is " Canine sleuth".)

I've seen this clue in The Times.
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