Companion of Tom and Dick

I believe the answer is:

harry

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'companion' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how one could define the other.

I don't understand the remainder of the clue.

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(Other definitions for harry that I've seen before include "Torment by constant attack" , "Persistently harass" , "English prince - trouble" , "Make repeated attacks on, badger" , "Wizard Potter" .)

I've seen this clue in the Evening Standard.

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