It grows hot at the border! (5)

I believe the answer is:

hedge

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'it grows' is the definition.
The definition suggests a singular noun which matches the answer.

'hot at the border' is the wordplay.
'hot' becomes 'h' (abbreviation eg on taps).
'at' means one lot of letters go next to another.
'the border' becomes 'edge' ('edge' can be a synonym of 'border').
'h'+'edge'='HEDGE'

Can you help me to learn more?

(Other definitions for hedge that I've seen before include "Fence of bushes or small trees" , "Shrubby boundary" , "Bushy boundary" , "Field barrier" , "bush as a > barrier" .)

I've seen this clue in the Evening Standard.

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