Good lines about active spies being very reserved (7)
I believe the answer is:
glacial
'very reserved' is the definition.
'glacial' can be an answer for 'reserved' (thesaurus). I'm not certain of the 'very' bit.
'good lines about active spies' is the wordplay.
'good' becomes 'g' (abbreviation).
'lines' becomes 'll' (I've seen this in other clues).
'about' indicates putting letters inside.
'active' becomes 'a' (grammatical abbreviation).
'spies' becomes 'cia' (Central Intelligence Agency).
'a'+'cia'='acia'
'll' placed around 'acia' is 'lacial'.
'g'+'lacial'='GLACIAL'
'being' is the link.
Can you help me to learn more?
(Other definitions for glacial that I've seen before include "Pertaining to the ice ages" , "Extremely cold" , "Of slow moving ice masses" , "Frigid" , "Cold and icy" .)