Exciting little streams at Southend (7)
I believe the answer is:
thrills
'exciting little streams at southend' is the definition.
I can't tell whether this defines the answer.
'streams at southend' is the wordplay.
'streams' becomes 'rills' (rill is a kind of stream).
'at' means one lot of letters go next to another (I've seen this in other clues).
'southend' becomes 'th' (I can't justify this - if you can you should give a lot more credence to this answer).
'rills' put after 'th' is 'THRILLS'.
Can you help me to learn more?
(Other definitions for thrills that I've seen before include "Waves of excited feelings" , "Excites" , "Hair-raising experiences" , "Delights" , "Excitement" .)