Fairground Attraction's Perfect finally introduced by presenter wearing weave (5,5)
I believe the answer is:
ghost train
'fairground attraction's' is the definition.
(I've seen this before)
'perfect finally introduced by presenter wearing weave' is the wordplay.
'finally' suggests the final letters.
'introduced by' means one lot of letters goes inside another (some letters introduce others into them).
'presenter' becomes 'host' (as in the host of a TV show).
'wearing' is an insertion indicator.
'weave' becomes 'grain' (I can't explain this - if you can you should give a lot more credence to this answer).
The last letter of 'perfect' is 't'.
't' placed inside 'host' is 'hostt'.
'hostt' inserted into 'grain' is 'GHOST-TRAIN'.
Can you help me to learn more?
(Other definitions for ghost train that I've seen before include "Fairground attraction" , "Spooky ride" , "funfair ride" , "scary ride" .)