Temporary signs, they're oddly disregarded before motorway turning (7)
I believe the answer is:
interim
'temporary' is the definition.
('interim' can be similar in meaning to 'temporary')
'they're oddly disregarded before motorway turning' is the wordplay.
'oddly' indicates alternate letters.
'disregarded' becomes 'in' (I can't justify this - if you can you should believe this answer much more).
'before' is a charade indicator (letters next to each other).
'motorway' becomes 'mi' (resembles Mi, English motorway).
'turning' says the letters should be written in reverse.
The alternating letters of 'theyre' are 'ter'.
'mi' backwards is 'im'.
'ter' put after 'in' is 'inter'.
'inter'+'im'='INTERIM'
'signs' is the link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for interim that I've seen before include "Meantime; temporary" , "Meantime - provisional" , "not there for ever" , "Meanwhile" , "temporary period" .)