Non-circular pontoons designed without suspension (7)
I believe the answer is:
nonstop
'without suspension' is the definition.
I can't judge whether this defines the answer.
'non-circular pontoons designed' is the wordplay.
'non' suggests deleting specific letters.
'circular' becomes 'o' (I've seen this in other clues).
'designed' is an anagram indicator (designed with the letters).
'pontoons' with 'o' removed is 'pntoons'.
'pntoons' anagrammed gives 'NONSTOP'.
Can you help me to learn more?
(Other definitions for nonstop that I've seen before include "(Of a flight) direct" , "Never pausing" , "Ceaselessly" , "Unending" , "Never-ending" .)