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In which to fish on a cold morning? (3)

Ross

I believe the answer is:

cam

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'in which to fish' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'on a cold morning?' is the wordplay.
'on' means one lot of letters go next to another.
'a cold' becomes 'c' (abbreviation, eg on taps).
'morning?' becomes 'am' (as in 12:00 AM).
'c'+'am' is 'CAM'.

Can you help me to learn more?

(Other definitions for cam that I've seen before include "Rotating part in machine; river" , "Irregular projection" , "It controls the motion of engine cylinder valves" , "Shaft on a rotating part in machinery" , "running through university city?" .)

I've seen this clue in the Evening Standard.
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