Deception leads to stress and will hinder them (9)
I believe the answer is:
constrain
'will hinder them' is the definition.
I can't tell whether this definition defines the answer.
'deception leads to stress' is the wordplay.
'deception' becomes 'con' (a con is a trick or deception).
'leads to' means one lot of letters go next to another.
'stress' becomes 'strain' (synonyms).
'con'+'strain'='CONSTRAIN'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for constrain that I've seen before include "Severely restrict" , "Compel towards a course of action" , "Lock up" , "Check" , "Hold back - non-racist (anag)" .)