Old German in my French group only good at Spanish? (8)
I believe the answer is:
monoglot
'only good at spanish?' is the definition.
(a monoglot speaks only one language)
'old german in my french group' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'german' becomes 'g' (abbreviation).
'in' indicates putting letters inside.
'my french' becomes 'mon' ('my' in French).
'group' becomes 'lot'.
'o'+'g'='og'
'mon'+'lot'='monlot'
'og' placed within 'monlot' is 'MONOGLOT'.
(Other definitions for monoglot that I've seen before include "Speaking or writing only one language" , "Without a second language" .)