In a bad way in Spain, very unwell, variable (6)
I believe the answer is:
evilly
'in a bad way' is the definition.
(I've seen this before)
'spain very unwell variable' is the wordplay.
'spain' becomes 'e' (abbreviation for Espana).
'very' becomes 'v' (abbreviation).
'unwell' becomes 'ill' ('ill' can be similar in meaning to 'unwell').
'variable' becomes 'y' (I've seen this in other clues).
'e'+'v'+'ill'+'y'='EVILLY'
'in' is the link.
(Other definitions for evilly that I've seen before include "With wicked intent" , "Extremely wickedly" , "in a bad way" , "In wicked or depraved way" , "In a very wicked manner" .)