Support record showing work not yet completed (7)
I believe the answer is:
backlog
'work not yet completed' is the definition.
(I've seen this before)
'support record' is the wordplay.
'support' becomes 'back' (back is a kind of support).
'record' becomes 'log' (log is a kind of record).
'back'+'log'='BACKLOG'
'showing' acts as a link.
(Other definitions for backlog that I've seen before include "work piling up" , "Accumulation of unfinished work" , "Accumulation (of work) to be dealt with" , "Amount of uncompleted work" , "Accumulation of jobs not done" .)