Something used to fence around base - estate's boundaries handling variable wind offshore (3,6)

I believe the answer is:

sea breeze

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

'wind offshore' is the definition.
'sea breeze' can be an answer for 'wind' (I've seen this before). I'm unsure of the 'offshore' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sea breeze that I've seen before include "Doctor" , "that creates a cool ambience around 6 [ISLE] ?" , "Vodka-based cocktail" , "Maritime wind" , "Gentle coastal wind" .)

I've seen this clue in The Independent.

Want a hint initially instead of a full solution? Install my app