Heavenly sign of love to the French (3)
I believe the answer is:
leo
'heavenly sign' is the definition.
'leo' can be an answer for 'sign' (star sign). I am not sure about the 'heavenly' bit.
'love to the french' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'to' means one lot of letters go next to another (I've seen this in other clues).
'the french' becomes 'le' ('the' in French).
'o' after 'le' is 'LEO'.
'of' is the link.
Can you help me to learn more?
(Other definitions for leo that I've seen before include "Astrological sign" , "certain stars" , "Man" , "Pope" , "one of several popes" .)