Having one call round on and smoothing things over (7)
I believe the answer is:
ironing
'smoothing things over' is the definition.
'ironing' can be an answer for 'smoothing' (I've seen this before). I'm unsure of the 'things over' bit.
'having one call round on' is the wordplay.
'having one' becomes 'i' (I can't explain this - if you can you should believe this answer much more).
'call' becomes 'ring' (telephone call).
'round' indicates putting letters inside.
'ring' going around 'on' is 'roning'.
'i'+'roning'='IRONING'
'and' is the link.
Can you help me to learn more?
(Other definitions for ironing that I've seen before include "Pressing clothes" , "gliding" , "Smoothing clothes, etc" , "Levelling out" , "Smoothing with heat" .)