Not adequately protected in dry river (8)
I believe the answer is:
'not adequately protected' is the definition.
(I've seen this before)
'in dry river' is the wordplay.
'dry' becomes 'sec' (similar in meaning).
'river' becomes 'ure' (river in Yorkshire).
(Other definitions for insecure that I've seen before include "safe? Hardly" , "exposed to danger" , "Lacking self-confidence or assurance" , "Fearful, unsafe." , "Sinecure for those lacking in confidence" .)