Loosely two GIs in turn hatching a plot (10)
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I believe the answer is:
intriguing
'hatching a plot' is the definition.
Both the answer and definition are adjectives. Maybe there's an association between them I don't understand?
'loosely two gis in turn' is the wordplay.
'two gis' means two substitutions for 'gi'.
'loosely' is an anagram indicator (a looser version of the letters).
'gi'+'gi'+'in'+'turn'='gigiinturn'
'gigiinturn' is an anagram of 'INTRIGUING'.
Can you help me to learn more?
(Other definitions for intriguing that I've seen before include "Conspiring; fascinating" , "What conspirators are up to" .)
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