Blush with violent urge to conceal love (5)
I believe the answer is:
rouge
'blush' is the definition.
(I know that blush can be written as rouge)
'violent urge to conceal love' is the wordplay.
'violent' indicates anagramming the letters.
'to conceal' is an insertion indicator.
'love' becomes 'o' (love means zero in tennis).
'urge' is an anagram of 'ruge'.
'ruge' enclosing 'o' is 'ROUGE'.
'with' is the link.
(Other definitions for rouge that I've seen before include "Cheek cosmetic" , "struggle at Eton" , "Type of make-up" , "Reddish cosmetic for colouring cheeks" , "Make-up item" .)