Tops up studies involving left overs (7)

I believe the answer is:

reloads

'tops up' is the definition.

'studies involving left overs' is the wordplay.
'studies' becomes 'reads' ('read' can be a synonym of 'study').
'involving' indicates putting letters inside.
'left' becomes 'l' (common abbreviation).
'overs' becomes 'o' (cricket abbreviation).
'l'+'o'='lo'
'reads' placed around 'lo' is 'RELOADS'.

I've seen this clue in The Independent.

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