Catherine Gee was appointed "head of corporate services" at Keep Scotland Beautiful (KSB) without the post being externally advertised, months after her husband became the charity's CEO. She was the only person to apply for the job.
SNP MSP John Wilson said the appointment raised "serious issues" for the charity.
KSB has a key role in helping reduce Scotland's carbon footprint, particularly in giving a lead on anti-litter strategies.