Crossword Genius

Are there a number of them on one coin? (5)

Ross

I believe the answer is:

heads

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

'are there a number' is the definition.
I can't tell whether this definition defines the answer.

'them on one coin?' is the wordplay.
'them' becomes 'hes' (I am not sure about this - if you are sure you should believe this answer much more).
'on' indicates putting letters inside (as in clothing 'on' a person).
'one' becomes 'a' (a thing is one thing).
'coin?' becomes 'd' (old British penny abbreviation).
'a'+'d'='ad'
'hes' going around 'ad' is 'HEADS'.

'of' is the link.

Can you help me to learn more?

(Other definitions for heads that I've seen before include "a 50-50 chance" , "Noddles; nuts" , "Goes for" , "Leaders" , "Obverse result of coin-tossing" .)

I've seen this clue in the Evening Standard.
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