Sparkling company gathered around field (6)
I believe the answer is:
agleam
'sparkling' is the definition.
(I've seen this before)
'company gathered around field' is the wordplay.
'company' becomes 'agm' (I can't explain this - if you can you should believe this answer much more).
'gathered around' means one lot of letters goes inside another.
'field' becomes 'lea' (lea can mean a meadow or field of grass).
'agm' enclosing 'lea' is 'AGLEAM'.
Can you help me to learn more?
(Other definitions for agleam that I've seen before include "scintillating" , "Bright" , "Shining brightly" , "Sparkling" .)