Get end of blunt instrument caught up (7)
I believe the answer is:
collect
'get end of blunt instrument caught up' is the definition.
I can't tell whether this definition defines the answer.
'get end of blunt instrument caught up' is the wordplay.
'end of' suggests the final letters.
'blunt instrument' becomes 'cello' (cello is a kind of instrument. I am not sure about the 'blunt' bit.).
'caught' becomes 'c' (cricket abbreviation).
'up' is a reversal indicator (in down clue: letters go upwards).
The final letter of 'get' is 't'.
't'+'cello'+'c'='tcelloc'
'tcelloc' written backwards gives 'COLLECT'.
(Other definitions for collect that I've seen before include "Assemble - a short prayer" , "Come together" , "mass" , "Fetch" , "Accumulate" .)