Swelled (7)
(Other definitions for dilated that I've seen before include "like pupils in the dark" , "Spoke at length" , "Opened up" , "Made more open/wide" , "Became more open" .)
'swelled' is the definition.
('distend' can be a synonym of 'swell')
This is the entire clue.
(Another definition for distended that I've seen is " Swollen with pressure".)
'swelled' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for surged that I've seen before include "caused a rush" , "Pushed forward or billowed like wave" , "Moved forward like fast wave" , "Increased in power rapidly" , "Rose" .)