Rind we are mostly bagging to keep (4,5)

'keep' is the definition.
(thesaurus)

'rind we are mostly bagging to' is the wordplay.
'rind' becomes 'peel' (peel is a kind of rind).
'we are' becomes 'we're' (contraction of 'we are').
'mostly' means to remove the last letter (most but not all of the word).
'bagging' indicates putting letters inside (bag can mean to take or obtain).
'peel'+'were'='peelwere'
'peelwere' with its final letter removed is 'peelwer'.
'peelwer' enclosing 'to' is 'PEEL-TOWER'.