On same ground, a header from Newcastle United (2,3,3)
I believe the answer is:
as one man
'header from newcastle united' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'on same ground a' is the wordplay.
I cannot really understand how this works, but
'on' is present in the answer.
an anagram of 'same' is 'asem' which is located in the remaining letters.
'a' could be 'an' and 'an' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for as one man that I've seen before include "All together, chaps" , "All together in unison - males only" , "with all in chorus?" , "in complete agreement" , "arguably sexist in Unison" .)