Superior catch, perhaps, one that is in firm grip? (5)
I believe the answer is:
cisco
'superior catch' is the definition.
'cisco' can be an answer for 'catch' (cisco is a kind of fish). I am unsure of the 'superior' bit.
'one that is in firm grip?' is the wordplay.
'one' becomes 'I' (Roman numeral).
'that is' becomes 'sc' (abbrv. for Latin scilicet; 'namely').
'in' indicates putting letters inside.
'firm grip?' becomes 'co' (I can't explain this - if you can you should believe this answer much more).
'i'+'sc'='isc'
'isc' going inside 'co' is 'CISCO'.
'perhaps' is the link.
Can you help me to learn more?
(Other definitions for cisco that I've seen before include "Catch" , "western kid?" , "Fish" .)