Full tuna ban arranged involving Germany (8)
I believe the answer is:
abundant
'full' is the definition.
(I've seen this before)
'tuna ban arranged involving germany' is the wordplay.
'arranged' indicates anagramming the letters.
'involving' is an insertion indicator.
'germany' becomes 'd' (international vehicle registration code).
'tuna'+'ban'='tunaban'
'tunaban' with letters rearranged gives 'abunant'.
'abunant' going around 'd' is 'ABUNDANT'.
(Other definitions for abundant that I've seen before include "Exuberant" , "Copious, profuse" , "In plentiful supply" , "Plentiful, ample" , "'Copious, galore (8)'" .)