An extra redhead, broader in the beam (5)

I believe the answer is:

wider

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

'broader in the beam' is the definition.
I can't tell whether this definition defines the answer.

'an extra redhead' is the wordplay.
'an extra' becomes 'wide' (cricket term).
'redhead' becomes 'r' (the head/first letter of 'red').
'wide'+'r'='WIDER'

Can you help me to learn more?

(Other definitions for wider that I've seen before include "Less narrow, say vision" , "Broader" .)

I've seen this clue in the Evening Standard.

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