A French estate agent is extremely scatty, making them nervous (6)
I believe the answer is:
uneasy
'nervous' is the definition.
(similar in meaning)
'a french estate agent is extremely scatty' is the wordplay.
'a french' becomes 'un' ('a' in French).
'estate agent' becomes 'ea' (this might be a standard abbreviation of which I'm unaware).
'is extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'scatty' with its centre taken out is 'sy'.
'un'+'ea'+'sy'='UNEASY'
'making them' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for uneasy that I've seen before include "Awkward" , "Restless or worried" , "Anxious, unquietly" , "Nervous, worried" , "Disquieted" .)