Constable would have had one tidying up trash in pub (10)

I believe the answer is:

paintbrush

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'constable would have' is the definition.
I can't judge whether this defines the answer.

'one tidying up trash in pub' is the wordplay.
'one tidying up' is an anagram indicator (Tidying up is rearranging).
'trash'+'in'+'pub'='trashinpub'
'trashinpub' with letters rearranged gives 'PAINTBRUSH'.

'had' acts as a link.

Can you help me to learn more?

(Other definitions for paintbrush that I've seen before include "applicator such as this" , "Artist's applier" , "Artist's tool" .)

I've seen this clue in The Telegraph.

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