Started when there was a need to go out to work (6)
I believe the answer is:
opened
'started' is the definition.
(opening is a kind of starting)
'there was a need to go out to work' is the wordplay.
I cannot really understand how this works, but
an anagram of 'need' is 'ened' which is located in the answer.
'work' could be 'op' (common abbreviation for 'opus') and 'op' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'when' is the link.
Can you help me to learn more?
(Other definitions for opened that I've seen before include "Unfurled" , "Afforded access" , "Turned key to permit entry, or removed lid" , "Turned key and unlocked" , "Started, a meeting say" .)