Crossword Genius

Sweeper used by a blockhead with some awkwardness (5)

Ross

I believe the answer is:

besom

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

'sweeper' is the definition.
(I've seen this before)

'a blockhead with some awkwardness' is the wordplay.
I cannot quite understand how this works, but
'blockhead' could be 'b' (head letter of 'block') and 'b' is found within the answer.
an anagram of 'some' is 'esom' which is located in the answer.
No letters remain.
This explanation may well be incorrect...

'used by' acts as a link.

Can you help me to learn more?

(Other definitions for besom that I've seen before include "sweeper" , "Twig broom" , "Broom made from twigs tied to a handle" , "Concoction of twigs" , "Twiggy broom" .)

I've seen this clue in the Evening Standard.
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