Uncertain about having a run in such splendid surroundings (10)
I believe the answer is:
precarious
'uncertain' is the definition.
(I've seen this before)
'a run in such splendid surroundings' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'in' means one lot of letters goes inside another.
'such splendid surroundings' becomes 'precious' (I can't justify this - if you can you should believe this answer much more).
'a'+'r'='ar'
'ar' placed into 'precious' is 'PRECARIOUS'.
'about having' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for precarious that I've seen before include "Highly insecure" , "Hairy" , "Not having a steady position" , "Uncertain; likely to fall" , "having difficulty remaining upright" .)