Waters and weeds around square (5)
I believe the answer is:
hoses
'waters' is the definition.
(e.g. flowers)
'weeds around square' is the wordplay.
'weeds' becomes 'hoes' (I've seen this in another clue).
'around' means one lot of letters goes inside another.
'square' becomes 's' (abbreviation).
'hoes' enclosing 's' is 'HOSES'.
'and' is the link.
(Other definitions for hoses that I've seen before include "Flexible pipes for conveying liquids" , "Lengths of piping" .)