Crossword Genius

Suppliers of fuel and I sport boring pants (3,5)

Ross

I believe the answer is:

gas pipes

'suppliers of fuel' is the definition.

'i sport boring pants' is the wordplay.
'sport' becomes 'PE' (physical education).
'boring' is an insertion indicator (some letters must 'bore' a hole into other letters).
'pants' becomes 'gasps' ('gasp' can be a synonym of 'pant').
'i'+'pe'='ipe'
'ipe' placed into 'gasps' is 'GAS-PIPES'.

'and' is the link.

(Another definition for gas pipes that I've seen is " They may join the main".)

I've seen this clue in The Guardian.
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