Shifting worst, keeping the Spanish tools (7)
I believe the answer is:
trowels
'tools' is the definition.
(trowel is a kind of tool)
'shifting worst keeping the spanish' is the wordplay.
'shifting' indicates an anagram.
'keeping' indicates putting letters inside.
'the spanish' becomes 'el' ('the' in Spanish).
'worst' anagrammed gives 'trows'.
'trows' placed around 'el' is 'TROWELS'.
(Other definitions for trowels that I've seen before include "Garden tools" , "Garden implements" , "Small hand tools" , "Hand tools for scooping" , "Tools for gardening and plastering" .)