Securely fixing Ian, returning with fish (7)
I believe the answer is:
nailing
'securely fixing' is the definition.
'nailing' can be an answer for 'fixing' (I've seen this before). I am not sure about the 'securely' bit.
'ian returning with fish' is the wordplay.
'returning' shows that the letters should be reversed in order.
'with' means one lot of letters go next to another.
'fish' becomes 'ling' (ling is a kind of fish).
'ian' back-to-front is 'nai'.
'nai'+'ling'='NAILING'
Can you help me to learn more?
(Other definitions for nailing that I've seen before include "Securely pinning" , "Securing" , "Catching" , "Fixing" , "Tacking" .)