Crossword Genius

Presumably he can be relied upon for dexterity (5-4,3)

Ross

I believe the answer is:

right-hand man

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

'presumably he can be relied upon for dexterity' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'presumably he' is the wordplay.
I cannot quite see how this works, but
'he' could be 'man' (I've seen this in another clue) and 'man' is found in the answer.
The remaining letters 'righthand' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for right-hand man that I've seen before include "Most trusted assistant" , "Important assistant" , "Indispensable personal aide" , "One's most valuable assistant" , "Indispensable assistant" .)

I've seen this clue in The Globe and Mail.
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