Put out about mistake getting such lengthy exposure (4-5)
I believe the answer is:
time-lapse
'such lengthy exposure' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'put out about mistake' is the wordplay.
'put out' becomes 'emit' (I've seen this before).
'about' is a reversal indicator.
'mistake' becomes 'lapse' (lapse is a kind of mistake).
'emit' reversed gives 'time'.
'time'+'lapse'='TIME-LAPSE'
'getting' acts as a link.
Can you help me to learn more?
(Other definitions for time-lapse that I've seen before include "Photography technique" , "Kind of cinematic technique for showing a slow process at an accelerated pace" , "Photographic technique to show very slow processes in motion" .)