Review design of parasail to include power source (9)
I believe the answer is:
appraisal
'review' is the definition.
'design of parasail to include power source' is the wordplay.
'design of' is an anagram indicator (I've seen this in other clues).
'to include' indicates putting letters inside.
'source' suggests taking the first letters (source can mean a beginning or origin).
The first letter of 'power' is 'p'.
'parasail' with letters rearranged gives 'apraisal'.
'apraisal' placed around 'p' is 'APPRAISAL'.
(Other definitions for appraisal that I've seen before include "Evaluation - price survey" , "rating" , "valuation" , "Formal assessment of an employee's performance" , "judgement" .)