Groom welcomes New Age colour (3,5)
I believe the answer is:
pea green
'colour' is the definition.
(I've seen this before)
'groom welcomes new age' is the wordplay.
'groom' becomes 'preen' (a bird grooms itself by preening feathers).
'welcomes' indicates putting letters inside (in sense of 'invites in').
'new' indicates an anagram.
'age' with letters rearranged gives 'eag'.
'preen' placed around 'eag' is 'PEA-GREEN'.
(Other definitions for pea green that I've seen before include "The colour of podded vegetables and the Owl and the Pussycat's boat" , "colour of Lear's boat" , "Bright colour (of vegetables)" , "Bright colour with a yellow tinge - eager pen (anag)" , "Shade of the Owl and the Pussycat's boat" .)