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In which clip round the ear might be necessary? (7)

Ross

I believe the answer is:

haircut

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'in which clip round the ear might be necessary?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'in which clip' is the wordplay.
'in which' becomes 'hair' (I can't explain this - if you can you should believe this answer much more).
'clip' becomes 'cut' (I've seen this before).
'hair'+'cut'='HAIRCUT'

Can you help me to learn more?

(Other definitions for haircut that I've seen before include "Bob for one" , "It proved fatal to Samson" , "Pageboy is one" , "Crop possibly" , "Bob, say" .)

I've seen this clue in The Telegraph.
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