Let off the lead, comes over to frighten one (7)
I believe the answer is:
startle
'frighten one' is the definition.
'startle' can be an answer for 'frighten' (I've seen this in another clue). I am not sure about the 'one' bit.
'let off the lead comes over' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'let' is 'tle' which is present in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
The remaining letters 'sar' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'to' acts as a link.
Can you help me to learn more?
(Other definitions for startle that I've seen before include "Scare" , "Make jump" , "Alarm (someone)" , "Surprise with fright" , "Astonish" .)