Nope! When writen, It has to be "아저씨(ssi)", but the good news is some Koreans pronounce 'ㅆ' as 'ㅅ'. e.g. 쌀 ☞ 살 싸서 ☞ 사서 \^o^/

the word is 아저씨 which was made originally from the first ^^; it's not about pronunciation. it could be a little confusing but...^^;