Crossword Genius

End of binge -- endless pain for a head (4)

Ross

I believe the answer is:

each

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

'end of binge endless pain' is the wordplay.
'end of binge' becomes 'e' (I can't justify this - if you can you should believe this answer much more).
'endless' means to remove the last letter.
'pain' becomes 'ache' (ache is a kind of pain).
'ache' with its last letter taken away is 'ach'.
'e'+'ach'='EACH'

'for' is the link.

Can you help me to learn more?

(Other definitions for each that I've seen before include "Every one of a number" , "...per head" , "Ache (anag.)" , "Singly, per capita" , "Everyone separately" .)

I've seen this clue in The Independent.
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