Bachelor nursed pain (4)

I believe the answer is:

ache

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

'pain' is the definition.
(ache is a kind of pain)

'bachelor nursed' is the wordplay.
'ACHE' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ache that I've seen before include "Persistent dull pain" , "Pine" , "Long ? pain" , "Dull steady pain" , "Similar" .)

I've seen this clue in The Mirror.

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