Somewhere along the line, it may be on fire! (7)
I believe the answer is:
station
'it may be on fire' is the definition.
The definition suggests a singular noun which matches the answer.
'somewhere along the line' is the wordplay.
'somewhere' becomes 'sati' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'along' becomes 'on' (synonyms).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'line' indicates putting letters inside.
'sati'+'on'='sation'
'sation' going around 't' is 'STATION'.
Can you help me to learn more?
(Other definitions for station that I've seen before include "Base for 9, 11, 12, 14 or 19" , "Such as Victoria" , "camp?" , "Broadcasting channel" , "Stopping-place" .)