Ageless English politician carries gun around (9)
I believe the answer is:
evergreen
'ageless' is the definition.
(I've seen this before)
'english politician carries gun around' is the wordplay.
'english' becomes 'E' (abbreviation).
'politician' becomes 'green' (eg member of the Green Party).
'carries' says to put letters next to each other (in a down clue, some letters go beneath others).
'gun around' becomes 'ver' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'green' after 'ver' is 'vergreen'.
'e'+'vergreen'='EVERGREEN'
Can you help me to learn more?
(Other definitions for evergreen that I've seen before include "Not deciduous" , "Of lasting popularity" , "Enduringly fresh" , "Always popular" , "Having an enduring freshness" .)