Recently developed top lawn is moist in the morning upsetting one of those at the recent match (8)
I believe the answer is:
'one of those at the recent match' is the definition.
I can't tell whether this definition defines the answer.
'recently developed top lawn is moist in the morning upsetting' is the wordplay.
'recently' becomes 'new' (synonyms).
'developed top lawn' becomes 'l' (I can't justify this - if you can you should give a lot more credence to this answer).
'is moist in the morning' becomes 'dewy' (I've seen this in another clue).
'upsetting' is a reversal indicator.
'dewy' written backwards gives 'ywed'.
Can you help me to learn more?
(Other definitions for newlywed that I've seen before include "One recently married" , "Bride or groom" .)