Pools appearing out of the blue, with breeze getting up (7)
I believe the answer is:
aquaria
'pools' is the definition.
(plural of aquarium)
'the blue with breeze getting up' is the wordplay.
'the blue' becomes 'aqua' (aqua is a kind of blue).
'with' means one lot of letters go next to another.
'breeze' becomes 'air' (synonyms).
'getting up' shows that the letters should be reversed in order.
'air' backwards is 'ria'.
'aqua'+'ria'='AQUARIA'
'appearing out of' acts as a link.
(Other definitions for aquaria that I've seen before include "display tanks" , "Tanks or buildings for fish" , "Transparent fish tanks" .)