Crossword Genius

G&S seen outside Globe needs justification (7)


I believe the answer is:


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'justification' is the definition.
(I know that grounds is a type of justification)

'gs seen outside globe' is the wordplay.
'seen outside' means one lot of letters goes inside another.
'globe' becomes 'round' (I can't justify this - if you can you should believe this answer much more).
'gs' placed around 'round' is 'GROUNDS'.

'needs' is the link.

Can you help me to learn more?

(Other definitions for grounds that I've seen before include "Dregs" , "they make coffee" , "Reasons" , "Area of enclosed land around a building" , "enclosure around house" .)

I've seen this clue in The Sun.
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