First seaside attraction to include rock, English made, at outset (7)
I believe the answer is:
premier
'first' is the definition.
(similar in meaning)
'seaside attraction to include rock english made at outset' is the wordplay.
'seaside attraction' becomes 'pier' (I've seen this before).
'to include' means one lot of letters goes inside another.
'at outset' says to take the initial letters.
The first letters of 'rock english made' is 'rem'.
'pier' going around 'rem' is 'PREMIER'.
(Other definitions for premier that I've seen before include "Aberdeen or Salisbury?" , "Foremost" , "First - head of government" , "man who's in charge" , "PM" .)