Detailed request to get men back using laboratory (2,5)
I believe the answer is:
in vitro
'back using laboratory' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'detailed request to get men' is the wordplay.
'detailed' means to remove the last letter (the tail of the word is removed).
'request' becomes 'invite' (inviting is a kind of requesting).
'to get men' becomes 'ro' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'invite' with its last letter taken away is 'invit'.
'invit'+'ro'='IN VITRO'
Can you help me to learn more?
(Other definitions for in vitro that I've seen before include "- - fertilisation (IVF)" , "By test tube; under glass" , "Done in a test tube" , "Taking place in a test tube (Latin)" , "In an artificial environment outside the living organism (Latin)" .)