Harry, Meghan and Vicar have a little stress at the start - some people take it on the chin (7,5)
I believe the answer is:
shaving cream
'some people take it on the chin' is the definition.
(some people use shaving cream to shave their chins)
'harry meghan and vicar have a little stress' is the wordplay.
'harry' indicates an anagram (harry can mean to attack or spoil).
'and' means one lot of letters go next to another (I've seen this in other clues).
'have' says to put letters next to each other.
'a little' says to take the initial letters.
The first letter of 'stress' is 's'.
'vicar'+'s'='vicars'
'meghan' after 'vicars' is 'vicarsmeghan'.
'vicarsmeghan' with letters rearranged gives 'SHAVING CREAM'.
'at the start' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for shaving cream that I've seen before include "Highly pressurised stuff" , "Facilitator of a razor" , "Male toiletry item for the face" , "Bathroom product" , "It aids facial hair removal" .)