Mature soldier follows revolutionary paramilitaries (5)
I believe the answer is:
adult
'mature' is the definition.
('adult' can be similar in meaning to 'mature')
'soldier follows revolutionary paramilitaries' is the wordplay.
I cannot really see how this works, but
'soldier' could be 'lt' and 'lt' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for adult that I've seen before include "I wasn't born yesterday" , "Older person" , "Mature, fully-grown" , "Person of mature age" , "Full-grown" .)