We lark around with a dog excerciser (6)

I believe the answer is:

walker

I'm a little stuck... Click here to teach me more about this clue!

'a dog excerciser' is the definition.
I can't judge whether this defines the answer.

'we lark around' is the wordplay.
'around' indicates anagramming the letters.
'we'+'lark'='welark'
'welark' is an anagram of 'WALKER'.

'with' acts as a link.

Can you help me to learn more?

(Other definitions for walker that I've seen before include "Rambler" , "Pedestrian" , "One going on foot" .)

I've seen this clue in the Evening Standard.

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