Didn't move from area that's dry — sense the environment (3,5)
I believe the answer is:
Here is my best explanation:
'didn't move' is the definition.
'area that's dry sense the environment' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'that's dry' becomes 'tt' (abbreviation for teetotal).
'sense' becomes 'sight' (sighting is a kind of sensing).
'the environment' means one lot of letters goes inside another (letters inserted into a new environment).
'att' placed within 'sight' is 'SAT TIGHT'.
'from' acts as a link.