Getting the enclosure back into it is awkward (5)
I believe the answer is:
inept
'awkward' is the definition.
(I know that awkward can be written as inept)
'getting the enclosure back into' is the wordplay.
'getting' is a charade indicator (letters next to each other).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'enclosure' becomes 'pen' (pen is a kind of enclosure).
'back' says the letters should be written in reverse.
'into' becomes 'i' (this might be a standard abbreviation which I don't know about).
't'+'pen'='tpen'
'tpen' in reverse letter order is 'nept'.
'nept' after 'i' is 'INEPT'.
'it is' is the link.
Can you help me to learn more?
(Other definitions for inept that I've seen before include "Lacking skill" , "Lacking any competence" , "Silly or senseless" , "Not competent" , "Silly - unskilled - unsuitable" .)