Gordon finally used up water for his veg (4)

I believe the answer is:

neep

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

'his veg' is the definition.
'neep' can be an answer for 'veg' (I've seen this before). I am not sure about the 'his' bit.

'gordon finally used up water' is the wordplay.
'finally' suggests the final letters.
'used up' says the letters should be written backwards (in a down clue, letters go up).
'water' becomes 'pee' (synonyms).
The final letter of 'gordon' is 'n'.
'pee' in reverse letter order is 'eep'.
'n'+'eep'='NEEP'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for neep that I've seen before include "Root" , "Scots veg" , "Scots turnip" , "(Scottish) turnip" , "vegetable in Scotland" .)

I've seen this clue in The Times.

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