Get brighter uniform in different parcel (5,2)
I believe the answer is:
clear up
'get brighter' is the definition.
'uniform in different parcel' is the wordplay.
'uniform' becomes 'u' (phonetic alphabet: alpha, bravo, charlie etc.).
'in' means one lot of letters goes inside another.
'different' indicates anagramming the letters.
'parcel' is an anagram of 'clearp'.
'u' placed within 'clearp' is 'CLEAR-UP'.
(Other definitions for clear up that I've seen before include "iron out" , "put things in order" , "Give reasons for" , "be less untidy" , "how conditions may improve" .)