It's my call to be affectionate (7)
I believe the answer is:
cordial
'affectionate' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'it's my call' is the wordplay.
'it's my' becomes 'cor' (both are expressions of surprise).
'call' becomes 'dial' (as in making a phone call).
'cor'+'dial'='CORDIAL'
'to be' is the link.
Can you help me to learn more?
(Other definitions for cordial that I've seen before include "Hearty, affectionate" , "Agreeable - drink" , "Warmly welcoming to the drink" , "Affable type of sweet drink?" , "Friendly; fruit drink" .)