Crossword Genius

Climber a pet wees on (5,3)

Ross

I believe the answer is:

sweet pea

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

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

'a pet wees on' is the wordplay.
'a pet wees' can be anagrammed to 'SWEET PEA'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for sweet pea that I've seen before include "Fragrant flower" , "Garden plant with brightly coloured flowers" , "bloomer" , "Fragrant bloom" , "Climbing plant with butterfly-shaped flowers" .)

I've seen this clue in The Independent.
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