### Clue: One who may file patent leather shoe at last takes on first concession around (10)
### Answer: REGISTRANT 
 ### Explanation: Definition: One who may file patent
A charade of R E ('leathe**R** sho**E** at last') plus ('takes on') GISTRANT, an envelope ('around') of IST (1st. 'first') in GRANT ('concessiuon').