Suddenly pedestrian in English city sent back summons (8)
I believe the answer is:
bathetic
'suddenly pedestrian' is the definition.
(bathetic means anticlimactic)
'english city sent back summons' is the wordplay.
'english city' becomes 'bath' (Bath is an English city).
'sent back' says the letters should be written backwards.
'summons' becomes 'cite' (synonyms).
'cite' back-to-front is 'etic'.
'bath'+'etic'='BATHETIC'
'in' acts as a link.
(Other definitions for bathetic that I've seen before include "sentimental" , "Anticlimactic" , "causing anticlimax" .)