Be burdensome in the way mentioned (5)
I believe the answer is:
weigh
'be burdensome' is the definition.
(I've seen this before)
'way mentioned' is the wordplay.
'mentioned' indicates a 'sounds like' (homophone) clue.
'way' is a homophone of 'WEIGH'.
'in the' acts as a link.
(Other definitions for weigh that I've seen before include "Quantify mass" , "Find the heaviness of" , "Estimate the value of" , "Assess" , "Raise anchor" .)