In the morning, twice having gal changing blend (7)
I believe the answer is:
amalgam
'blend' is the definition.
(I've seen this before)
'in the morning twice having gal changing' is the wordplay.
'in the morning' becomes 'am' (AM on a clock).
'twice' shows that letters should be duplicated.
'having' is an insertion indicator.
'changing' is an anagram indicator.
'am' doubled is 'amam'.
'gal' with letters rearranged gives 'alg'.
'amam' placed around 'alg' is 'AMALGAM'.
(Other definitions for amalgam that I've seen before include "Ring-bearing hobbit" , "Combination of diverse elements" , "A soft pliable mixture" , "Blend or combination" , "Mixture/blend" .)