Beaming head off, do well at golf in the morning (6)
I believe the answer is:
agleam
'beaming head off do well' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
'at golf in the morning' is the wordplay.
'at' becomes 'ale' (I can't explain this - if you can you should believe this answer much more).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'in the' is an insertion indicator.
'morning' becomes 'am' (as in al:00 AM).
'ale' placed around 'g' is 'agle'.
'agle'+'am'='AGLEAM'
Can you help me to learn more?
(Other definitions for agleam that I've seen before include "Sparkling" , "scintillating" , "Bright" , "Shining brightly" .)