An old scout's dog? (5)

I believe the answer is:

rover

I believe this clue is a double definition.

'an old scout's' is the first definition.
(Rover Scouts is a Boy Scouts organisation)

'dog?' is the second definition.
(Rover is a common name for a pet dog)

(Other definitions for rover that I've seen before include "Pirate; dog's name" , "pirate ship" , "Person who wanders - a good name for dog" , "Nomad" , "Wanderer, traveller" .)

I've seen this clue in the Evening Standard.

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