Solder damaged boxing ring that's a pinkish colour (3,4)
I believe the answer is:
old rose
'pinkish colour' is the definition.
'old rose' can be an answer for 'colour' (old rose is a kind of colour). I'm unsure of the 'pinkish' bit.
'solder damaged boxing ring' is the wordplay.
'damaged' indicates anagramming the letters.
'boxing' means one lot of letters goes inside another ('box' can mean contain, as in to put in a box).
'ring' becomes 'O' (letter resembling a ring).
'solder' with letters rearranged gives 'oldrse'.
'oldrse' enclosing 'o' is 'OLD-ROSE'.
'that's a' acts as a link.
Can you help me to learn more?
(Other definitions for old rose that I've seen before include "colour" , "pink" .)