Fish roe starter is on menu at army base (8)
I believe the answer is:
garrison
'base' is the definition.
(garrisoning is a kind of basing)
'fish roe starter is on' is the wordplay.
'fish' becomes 'gar' (type of gar).
'starter' suggests taking the first letters.
The first letter of 'roe' is 'r'.
'gar'+'r'+'is'+'on'='GARRISON'
'menu at army' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for garrison that I've seen before include "Roarings (anag.)" , "Provide (place) with troops for defence" , "Troops defending a town or fortress" , "army base?" , "Military base" .)