Squarely halved, you can depend on it (4)
I believe the answer is:
rely
'depend on it' is the definition.
(I've seen this before)
'squarely halved' is the wordplay.
'halved' indicates taking half.
'squarely' halved is 'RELY'.
'you can' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for rely that I've seen before include "Depend or lean on" , "Be dependent" , "City with cathedral" , "Be sure" , "Trust, depend" .)