Risk rows again holding up fuel production line (8)
I believe the answer is:
gasworks
'fuel production line' is the definition.
(places processing gas for fuel)
'risk rows again holding up' is the wordplay.
'holding' says the answer is hidden in the clue.
'up' is a reversal indicator (in down clue: letters go upwards).
'skrowsag' is hidden in the letters of 'risk rows again'.
'skrowsag' back-to-front is 'GASWORKS'.
(Other definitions for gasworks that I've seen before include "Plant generating source of domestic energy" , "Place for manufacturing fuel" , "Energy supplier" .)