Crossword Genius

One giving all-round strength in leadership? (4)

Ross

I believe the answer is:

boss

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

'one giving all-round strength in leadership?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'one giving all-round' is the wordplay.
I cannot quite understand how this works, but
'round' could be 'o' (round can mean a round object) and 'o' is present in the answer.
The remaining letters 'bss' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for boss that I've seen before include "Domineer" , "Team manager" , "Bully" , "Governor" , "Master - stud" .)

I've seen this clue in the Evening Standard.
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