Snarled up net, finally used rod and line (7)
I believe the answer is:
tangled
'snarled up' is the definition.
(I've seen this before)
'net finally used rod and line' is the wordplay.
'finally' indicates one should take the final letters.
'used rod and line' becomes 'angled' (fishing terminology).
The final letter of 'net' is 't'.
't'+'angled'='TANGLED'
(Other definitions for tangled that I've seen before include "Complex" , "Muddled together, complicated" , "''Oh what a ... web we weave / when first we practise to deceive'' (Walter Scott)" , "Knotted" , "Caught" .)