With water, there’s call to be economical (7)
I believe the answer is:
sparing
'economical' is the definition.
('sparing' can be a synonym of 'economical')
'with water there's call' is the wordplay.
'with' means one lot of letters go next to another.
'water there' becomes 'spa' (I've seen this before. I am not sure about the 'there' bit.**).
'call' becomes 'ring' ('ring' can be a synonym of 'call').
'spa'+'ring' is 'SPARING'.
'to be' is the link.
Can you help me to learn more?
(Other definitions for sparing that I've seen before include "Thrifty" , "mean" , "Economical; having mercy" , "Moderate, economical" , "Scanty - merciful" .)