Crossword Genius

A colleague of Castro is hurt (4)

Ross

I believe the answer is:

ache

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

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

'a colleague of castro' is the wordplay.
'colleague of castro' becomes 'che' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'che'='ACHE'

Can you help me to learn more?

(Other definitions for ache that I've seen before include "Each (anag.)" , "Long ? pain" , "Persistent dull pain" , "Play up" , "painful" .)

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