Clearly expressed by Poet Laureate I caught during leave (8)
I believe the answer is:
explicit
'clearly expressed' is the definition.
(I've seen this before)
'poet laureate i caught during leave' is the wordplay.
'poet laureate' becomes 'pl'.
'caught' becomes 'c' (cricket abbreviation).
'during' means one lot of letters goes inside another.
'leave' becomes 'exit' ('exit' can be a synonym of 'leave'**).
'pl'+'i'+'c'='plic'
'plic' placed into 'exit' is 'EXPLICIT'.
'by' is the link.
(Other definitions for explicit that I've seen before include "leaves nothing to the imagination" , "full detail" , "Hard-core" , "Clear and without reservation" , "Express - precise" .)