Word of initials for companion in the morning (7)
I believe the answer is:
acronym
'word of initials' is the definition.
'acronym' can be an answer for 'word' (acronym is a kind of word). I am unsure of the 'of initials' bit.
'companion in the morning' is the wordplay.
'companion' becomes 'crony' (I've seen this before).
'in the' means one lot of letters goes inside another.
'morning' becomes 'am'.
'crony' inserted into 'am' is 'ACRONYM'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for acronym that I've seen before include "UNICEF, perhaps" , "quango, perhaps" , "Word made form first letters of other words" , "Word such as radar, laser" , "radar, for one" .)